Are you, my friend, actually implying that Bus Rapid Transit lines can handle the same capacity as Light Rail transit lines?
Unless you want passing lanes that take up road space, Bus Rapid Transit isn't really that rapid at most ~3,000 PPH.
LRT's can be coupled and platforms extended when demand rises to accommodate up to 15,000 PPH in exclusive right of ways, maybe about 9-10,000 PPH for Sheppard's configuration if full transit priority is in place with coupled vehicles. Bus rapid transit does not use space as efficiently, and because it's independently navigated and not on a track the ride isn't as comfortable and it does not attract as many riders.
The reason why the TTC did not chose BRT is because to accommodate Sheppard's growing ridership bypass lanes would be required, and there is not enough space to create a healthy walking environment or accommodate two lanes of traffic, a bike lane, separate turning lanes and BRT WITH passing lanes..
Who would really wants to ride a bus, anyways?
No, I'm implying that the projected ridership for most of the Transit City lines falls within the limits of BRT. The only lines that really don't are the Eglinton LRT, the Scarborough LRT, the Waterfront West LRT, and the Finch West LRT after about 2025. The Don Mills LRT (north of Eglinton), the Jane LRT, the Sheppard East LRT, and the Scarborough-Malvern LRT could all be built as curb side BRT and have no problems with capacity.
Woodroffe Ave carries between 3,500 and 4,000 pphpd, with no problems. None of those Transit City lines mentioned above, even at the 2031 projections, are going to get in that range. Sheppard's 2031 projection is 3,100 pphpd. And bypass lanes? It's called the general traffic lane immediately to the left. Buses do that in downtown Ottawa all the time.
Honestly, it's not a big deal as people are making it out to be. The "problems" that are being raised about BRT are pretty minor, and certainly don't justify spending 2-3x more on LRT than would be spent building BRT.